Question: Initially at rest, a small copper sphere with a mass of 3 . 8 5 1 0 - 6 kg and a charge of 4

Initially at rest, a small copper sphere with a mass of 3.8510-6 kg and a charge of 4.5110-4 C is accelerated through a 6890-V potential difference before entering a magnetic field of magnitude 3.93 T, directed perpendicular to its velocity. What is the radius of curvature of the sphere's motion in the magnetic field?

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